posts_groupby хук-фильтр . WP 2.0.0

Filters the GROUP BY clause of the query.

Использование

add_filter( 'posts_groupby', 'filter_function_name_9901', 10, 2 );
function filter_function_name_9901( $groupby, $this ){
	// filter...

	return $groupby;
}

$groupby(строка)

The GROUP BY clause of the query.

$this(WP_Query)

The WP_Query instance (passed by reference).

Где используется хук

Код хука

...
			 * @since 1.5.0
			 *
			 * @param string   $where The WHERE clause of the query.
			 * @param WP_Query $this The WP_Query instance (passed by reference).
			 */
			$where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) );

			/**
			 * Filters the GROUP BY clause of the query.
			 *
			 * @since 2.0.0
			 *
			 * @param string   $groupby The GROUP BY clause of the query.
			 * @param WP_Query $this    The WP_Query instance (passed by reference).
			 */
			$groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) );

			/**
			 * Filters the JOIN clause of the query.
			 *
			 * Specifically for manipulating paging queries.
			 *
			 * @since 1.5.0
			 *
			 * @param string   $join  The JOIN clause of the query.
			 * @param WP_Query $this The WP_Query instance (passed by reference).
			 */
			$join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) );

			/**
			 * Filters the ORDER BY clause of the query.
...